Gun for two component adhesives



Jan. 14, 1964 c. J. HERMAN ETAL 3,117,696

GUN FOR TWO COMPONENT ADHESIVES 2 Sheets-Sheet 1 Filed July 12. 1961 INVENTORS. Cyril J. Herman BY David 611th, 5r.

AGENT Jan. 14, 1964 c. J. HERMAN ETAL 3,117,696

GUN FOR TWO COMPONENT ADHESIVES Filed July 12, 1961 2 Sheets-Sheet 2 INVENTORS. C riI J. Herman avid 611th, 5r.

AGENT United States Patent 3,117,695 GUN FDR WK) CGMPONENT ADEESIVES Cyril 3. Herman, Riverside Conn. (116 S. Main St, Portville, N.Y.), and David C. Gnth, Sax, Westport, Conn. (23 Sweetgum Road, Levittown, Pa.) Filed July 12, 196i, gar. No. 123,979 7 Claims. (8i. 222-137) This invention relates to guns or dispensing devices for t.vo component adhesives wherein two components or" an adhesive substance set up comparatively quickly when mixed together and so cannot be stored in a single container, or in use, re said to have a pot-life of the order oi hours rather than Weeks or months necessary for a reasonable shelf-life.

One example of such adhesives is epoxy resin which is mixed for curing with an amine such as triethylene tetramine. Such a system is well known to the art. Another is the polyurethane system. Often powdered aluminum or silica flour is added to one of the components or mi):- ture to give greater adhesion.

An object of the invention is to provide a device of this kind by wmch the two components may be mixed substantially at the point of application in proper proportions.

Another object is to provide a device of this kind which is small and light enough in weight to be held in the hand for easy manipulation and yet will contain completely therein some of each component.

Another object is to provide a device of this kind in which there is a mixing chamber of very small size.

Yet another obiect of the invention is to provide a device of this type in which the danger of clogging is reduced to practical limits.

And still another object of the invention is to provide a dispenser in which comparatively small quantities of each of the two components may be loaded, as for example, from a collapsible tube, so that small quantities of the components may be purchased and used in small amounts.

The attainment of these objects is reached, in a guntype applicator or dispenser which, briefly described, comprises two storage cylinders for the two separate components of the adhesive having a common dispensing head thereon and provided with an expelling and mixing plunger rod. Means are provided to reciprocate the rod and at the same time meter increments of the components from the cylinders to the head.

In the accompanying drawing showing, by way of example one of many possible embodiments of the invention,

FIG. 1 is a plan of the dispenser;

FIG. 2 is a side view of the dispenser with parts in one position;

FIG. 3 is a side view of the dispenser with parts in another operational position, and

FIG. 4 is a schematic representation of elements of the metering means.

The applicator comprises a body generally designated 19 having a pistol grip handle 11; and a forward or cylinder-carrying portion 12 generally symmetrical about the vertical mid-plane having left and right spaced socket members 14:: and i lb provided with parallel cylindrical recesses 15:: and 15b.

Axially parallel storage cylinders 16a and 16b for the two components are mounted fast in the recesses and project forwardly generally as does the barrel of a revolver, and may be substantially closed at their rear as at 18. These cylinders are provided with rather tightly fitting pistons 13a and 1% having threaded rods ids and Zilb fast thereon and extending rearwardly through holes 21 in the body ill and above the handle.

etented Jan. 1%5

The forward portions 22 of cylinders 16a and 16b are provided with a symmetrical head 24 with recesses 25:; and 25/) having a medial longitudinal bore or small mixing chamber 26 between the recesses 25a and 2512 which have each an annular end wall 28 and a further recess of reduced diameter 21 and 2% respectively.

The head is provided with laterally opening ports and 3% internally threaded as at 31 and for communication from the exterior to the interior of the respective storage cylinders ahead of the pistons. Collapsible tubes containing the separate components may be used to load the cylinders through the ports, particularly tubes having necks threaded to lit the port threads 31 so as to reduce the chance of spillage, which ports are sealed as by screw plugs 32.

The recesses 29:; and 2% terminate somewhat conically as at 35 and straight duct bores 34a and 34b connect the chamber bore as as at 36 in the conical zones with the interiors of the cylinders lea and 16b. it is to he noted that these duct bores extend onwardly to the ports Sila and 3&5 at such an angle that, say, a wire may be inserted into the duct from the port in the event the duct bore becomes clogged. For ease of use, the forward end or" the head at the chamber bore 26 is formed somewhat as a nozzle 38.

A plunger rod 3%, preferably of nylon plastic or fluorinated plastic material such as Teflon, both of which have low adhesion to epoxy and urethane resins, is disposed in the chamber bore, projecting rearwardly between the two cylinders, for reciprocation and rotation in the chamber bore. Preferably the head 24 is of steel, stainless steel, or aluminum, and the chamber bore 26 about 0.601 inch larger in diameter than the plunger rod 39. With this clearance and choice of materials just mentioned, there is substantially no danger of fouling in normal use.

The limits of reciprocation by the plunger rod are such that the outer end 4% of the rod projects from the head slightly in extreme forward position and is retracted bethe duct bore junction 36 upon Withdrawal.

The plunger rod 39 is rotated by a somewhat ring sector or Ll-shaped gear member ll having laterally projecting teeth .2 engaging with teeth 44 on the plunger rod extending thereon for a sufficient distance so that the two sets of teeth may be engaged during the reciprccatory motion of the plunger while the teeth 42 move in a somewhat circular path in a vertical plane.

The member is pivoted at one end 45 of an arm thereof to the body it; between and under recesses and at 43 and is held suiiiciently close to the teeth or" the rod by, as shown, the right cylinder 16b. The arm occupies the normal trigger position of a revolver and oscillation of the gear member causes the plunger rod to sp '1 back and forth.

Reciprocation of the plunger is accomplished by a lon gitudinal movement of a bearing 3% carrying the rear end portion 5i) of the plunger at a part 51 of reduced diameter. The bearing is pivotally mounted, as at 5'2, about midway on the lower arm 54 of an inverted L-shaped lever rocker 5S pivoted at as on and between upwardly projecting arms 53 on the body it The lower portion 52 of the rocker arm 54 is provided with a longitudinal slot 6% receiving a pivot pin 61. fast on the gear member arm 46 below its pivot 48. This combination provides a loose linkage between the arms 46 and 54 permitting the arm 5'4 to be drawn rearwardly in trigger fashion. The rocker and gear member arms 54 and 46 are biased to forward position by a spring 62 mounted on the handle 11 so that the end 4% of the plunger is normally in projecting position from the nozzle 35.

Feed to the mixing chamber bore 26 through ducts 34a and 34b is obtained by metered forward movement cameos of pistons 1M and 29b in predetermined increments. To end, gears 6 in and having tlueaded central holes threaded on the respective piston rods and 2% and disposed in a transverse s ot 65 in the body it to be turned in increr eats. T turning is carried out l y ratchet w eel means do, well lmown to the art, on ast one of th gears, and actuated by a vertically reclprocatory rmllient strip es having a hook 6'7 to enthe wheel and pivoted to the upper arm 59 of the oclrer, as at $6, where it overhangs rearwardly the slot 1 A friction washer may be provided between the ratchet wheel and the wall to the slot necessary.

in order to avoid the need for left handed threads on a gear and piston rod set and to use only one ratchet, though these avoidances not necessary, an intermediate gear 7% may be provided. indeed it may be desirable to have an additional strip 6 havin a hook to engage ratchet wheel on the gear 614:. This makes the system of FIG. 4 double acting, and by the omission of the gear 76' and varying the er iective range of the movement of the strips 68 and the rates of travel of the pistons can be varied.

in use, collapsible tubes containing the components are first screwed into ports and with the metering pistons forward position. The pistons are then forcibly turned, as by a crank (not shown) fitted on the squared ends ll of the piston rods, to retract the pistons in the cylinders, the threaded gears being held against;

tut ag if necessary. This, attended by, if necessary, a squee g on the tubes, charges the cylinders 15a and too with the separate components and the tubes are then removed and ports closed with their plugs.

Upon drawing on the trigger-like gear member arm 54, the pluner is retracted in the chamber bore 26, uncoveri the ducts Meanwhile, the rocking of the L-shaped rocker 55 lifts the ratchet strip 68 causing the wheel 66 and gears --.1 and 64b to turn about the piston rods and advance the pistons and force an increment of each component into the chamber bore.

Upon release of the trigger the plunger advances in the chamber bore with a spinning action, the pointed end "it? of the plunger aifording greater surface for contact with admitted components so that the two compo nents are mixed in the chamber bore as they become expolled therefrom,

If the ratchet system is double acting, pressure builds up in the cylinders during forward motion of the plunger past the duct 3%. Generally this is not desirable but in the case of thin components, the additional pressure with the plunger in forward position sometimes tends to make them stick to the rear portion of the plunger and foul up. Cm the other hand, wit thicker components, it is desi able to h ve pressure building up during the forward stroke of the plunger so that how of the components into the chamber bore is more rapid when the duct passages become uncovered. The action of either of the ratchet strips 68 or -53 may be eliminated by merely holding the appropriate strip away from its Wheel.

By having the plunger biased to forward position the amount of mixed adhesive left in the chamber bore is kept to a min mum. This advantage is enhanced by having the pistons act only during retraction of the oying appropriate ratcheting.

The invention claimed is:

1. In an applicator for a two-component adhesive, a pistol grip body; two storage containers for the components mounted on the body; a dispensing head in fixed relationship to the body and provided with a mixing chamber bore and with two ducts from the bore in communication with the interior of the respective containers; a rod rotatable and reciprocatory with respect to the head and in the bore and provided with gear teeth to the rear of the head; a generally U-shaped gear sector pivotally mounted at one end thereof and on the body and having laterally projecting teeth engageable with said gear teeth on the rod and a lever as a trigger-like finger piece tally carried on the gear sector and pivotally moun ed on the body for turning the gear sector and rod en the lever pivots on the body; means for converti g pivotal movement of the lever to reciprocatory movement of the rod, and means for feeding the components from the containers into the bore by pivotal movement of said lever.

2. an applicator for a two-component adhesive, :1 pistol-grip body; a pair of storage cylinders for the com pone .s mo ed on the body and having pistons with rods therein; a head having a mixing and dispensing chamber and mounted on the cylinders, ducts being provided in the head for communication between the chamber cylinders for admission of the comoonents into the chamber; rod rotatably and slidably disposed in the chamber for mixing the com onents entering the chamber from the cylinders; said body being provided with upstanding supports at the upper portion thereof; an L-shaped lever member pivotally mounted for rocking at the corner portion thereof between the supports, one i of the l ver member projecting downwardly as a trigger-like finger piece and the other arm projecting rearwardly the body being provided with an upwardly open transverse slot to the rear of the supports and under said other arm; a ratchet wheel substantially threaded on one of the piston rods and in the slot and a ratchet memer engageable with the wheel for turning same and pivoted to said other arm; and means for converting rocking movement of the lever member to rotary motion of the rod; and means on the finger piece for reciprocating the rod in the chamber.

3. A dispenser for a two-component adhesive compristwo parallel storage cylinders for the components of tile adhesive and a pistol-grip body carrying same; a head on the cylinders and having a mixing chamber bore open forward to the exterior and in communication with the interior of the cylinders via ducts openin on opposite sides of the bore; a reciprocatory and rotatable plunger rod in the bore and projecting rearwardly therefrom; the plunger rod being movable forward of the ducts; pistons having rods fast thereon in the cylinders for forcing the respective components into the chamber bore; Wheels threaded on the respective piston rods, the body being provided with a transverse upwardly open slot receiving the wheels and preventing rearward motion of the wheels; means for transmitting turning motion of one wheel to another, the pistons being tight enough in their respective cylinders so that rotation of the threaded wheels pro duces axial movement of the piston rods and pistons; 21 U-sha ed gear member having an end portion thereof pivoted on the body for oscillatory movement of the gear member and having lat rally projecting teeth; gear means on the plunger rod and engaging said teeth during oscillation of the gear member; an L-shaped rocker pivotally mounted on the body above and forward said wheels and having an arm depending as a trigger-like finger piece and the other having ratchet means associated with one of the wheels for turning same by rocking of the rocker, the finger piece being loosely pivoted to the gear member so that rocking of the rocker will oscillate the gear mem her, and a double thrust bearing on the plunger rods pivoted on the roclzer so that rocking same will reciprocate the plunger member.

4. An appli ator for a two-component adhesive comprising a pistol-grip body; a pair of storage cylinders for the components on the body side by side and having a common head provided with a bore shaped mixing chamher and with conduit bores in comunication with the chamber and the interior of the respective cylinders; a plunger rod in the chamber and extending rearwardly from tie head and between the cylinders, a part or" the rear end portion of the rod hrving a portion of reduced diameter; laterally spaced arms fast on the body and proice-ting upwardly therefrom near the rear ends of the cylinders; rocker member between the arms and cylinders and pivotally mounted on the arms, the rocker member having a pending trigger-like lower portion; a hear-- ing pivotally mounted on said lower portion for forward and rearward movement with the lower portion and re ceiving the portion of the rod of reduced diameter for reciprocating the rod, the latter being rotatable in the bearing; the rod being provided with pinion teeth between the bearing and the head; a generally U-shaped sector gear pivoted at one end thereof to the body and having lateral teeth on the other end portion to engage the pinion teeth; pin-and-slot means for pivoting the lower end portion of the rocker member to the sector gear remote from said one end for constraining the sector gear to turn when the lower end portion is pulled in trigger fashion; bias means for urging the lower end portion forward, and feeding means for forcing the components from the cylinders into the chamber when lower end is pulled, whereby repeated pulling of said lower end portion in trigger fashion will rotate and reciprocate the rod to mix the components and expel the mixture from the head.

5. An applicator as claimed in claim 4, said feeding 6 means including pistons in the respective cylinders, and ratcheted means for advancing the pistons when the lower end portion of the rocker member is pulled.

6. An applicator as claimed in claim 4, the chamber having a diameter about 0.001 inch greater than that of the plunger rod and the latter being of nylon plastic to minimize fouling and freezing of the rod in the chamber by the adhesive.

7. An applicator as claimed in claim 4, the rod being long enough and the bias means having sufficient acting range for the rod to normally project from the extreme forward end of the head to reduce the chance of sutficient mixed adhesive being left in the bore of the chamber to set up.

References Qited in the file of this patent UNITED STATES PATENTS 1,663,338 Gagne Mar. 20, 1928 2,814,827 Snow et a1. Dec. 3, 1957 20 2,913,151 Wiseman et al. V V. Nov. 17, 1959 

2. IN AN APPLICATOR FOR A TWO-COMPONENT ADHESIVE, A PISTOL-GRIP BODY; A PAIR OF STORAGE CYLINDERS FOR THE COMPONENTS MOUNTED ON THE BODY AND HAVING PISTONS WITH RODS THEREIN; A HEAD HAVING A MIXING AND DISPENSING CHAMBER AND MOUNTED ON THE CYLINDERS, DUCTS BEING PROVIDED IN THE HEAD FOR COMMUNICATION BETWEEN THE CHAMBER AND CYLINDERS FOR ADMISSION OF THE COMPONENTS INTO THE CHAMBER; A ROD ROTATABLY AND SLIDABLY DISPOSED IN THE CHAMBER FOR MIXING THE COMPONENTS ENTERING THE CHAMBER FROM THE CYLINDERS; SAID BODY BEING PROVIDED WITH UPSTANDING SUPPORTS AT THE UPPER PORTION THEREOF; AN L-SHAPED LEVER MEMBER PIVOTALLY MOUNTED FOR ROCKING AT THE CORNER PORTION THEREOF BETWEEN THE SUPPORTS, ONE ARM OF THE LEVER MEMBER PROJECTING DOWNWARDLY AS A TRIGGER-LIKE FINGER PIECE AND THE OTHER ARM PROJECTING REARWARDLY THE BODY BEING PROVIDED WITH AN UPWARDLY OPEN TRANSVERSE SLOT TO THE REAR OF THE SUPPORTS AND UNDER SAID OTHER ARM; A RATCHET WHEEL SUBSTANTIALLY THREADED ON ONE OF THE PISTON RODS AND IN THE SLOT AND A RATCHET MEMBER ENGAGEABLE WITH THE WHEEL FOR TURNING SAME AND PIVOTED TO SAID OTHER ARM; AND MEANS FOR CONVERTING ROCKING MOVEMENT OF THE LEVER MEMBER TO ROTARY MOTION OF THE ROD; AND MEANS ON THE FINGER PIECE FOR RECIPROCATING THE ROD IN THE CHAMBER. 